Bissau climate

Name: Bissau
Address: GW

Bissau is warmest in March, with average highs of 35 °C, and coldest in January, when nights average 21 °C. August is the wettest month (446 mm) and March the driest (0.01 mm). Figures are 1991–2020 climate normals.

Across a full year Bissau averages 1,356 mm of rain and 364 days above 25 °C.

Guinea-Bissau · population 439,704 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month March 35 °C
Coldest month January 21 °C
Driest month March 0 mm
Wettest month August 446 mm
Least cloud March 28 % cloud
Hottest on record March 40 °C
Coldest on record January 16 °C
Warmest sea November 29 °C

What to expectBissau through the year

Bissau changes little through the year. Average daily highs stay between 33 and 35 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 364 days a year reach 25 °C, 262 of them reach 30 °C. The warmest reading in the 1991–2020 record is 40 °C, in March.

Rain is strongly seasonal. August averages 446 mm against 0 mm in March — 44,630 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Bissau is warmest in November at 29 °C and coldest in February at 25 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	32.8 °C	under 1 mm	39 %
February	34.2 °C	1 mm	33 %
March	34.9 °C	under 1 mm	28 %
April	34.4 °C	under 1 mm	32 %
May	33.4 °C	6 mm	45 %
June	31.5 °C	86 mm	71 %
July	28.9 °C	345 mm	83 %
August	28.3 °C	446 mm	86 %
September	29.0 °C	306 mm	83 %
October	30.3 °C	141 mm	64 %
November	31.8 °C	23 mm	49 %
December	32.7 °C	2 mm	45 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	32.8 °C	20.5 °C	25.9 °C	37.5 °C	16.0 °C	31	29
February	34.2 °C	21.2 °C	26.9 °C	38.9 °C	17.9 °C	28	28
March	34.9 °C	22.4 °C	27.7 °C	40.2 °C	19.0 °C	31	30
April	34.4 °C	23.2 °C	27.8 °C	39.7 °C	20.1 °C	30	30
May	33.4 °C	24.2 °C	27.9 °C	39.0 °C	20.9 °C	31	30
June	31.5 °C	25.3 °C	27.8 °C	36.7 °C	21.7 °C	30	24
July	28.9 °C	24.6 °C	26.3 °C	33.6 °C	22.8 °C	31	5
August	28.3 °C	24.3 °C	25.9 °C	31.6 °C	22.5 °C	31	2
September	29.0 °C	24.4 °C	26.3 °C	32.2 °C	22.9 °C	30	6
October	30.3 °C	25.0 °C	27.3 °C	33.0 °C	22.6 °C	31	19
November	31.8 °C	24.2 °C	27.6 °C	35.1 °C	18.9 °C	30	28
December	32.7 °C	21.6 °C	26.5 °C	35.8 °C	17.7 °C	31	30

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	under 1 mm	0	12 h/day	39 %	43 %	16 km/h	25.1 °C
February	1 mm	0	12 h/day	33 %	45 %	16 km/h	25.0 °C
March	under 1 mm	0	12 h/day	28 %	52 %	17 km/h	25.8 °C
April	under 1 mm	0	12 h/day	32 %	58 %	18 km/h	26.6 °C
May	6 mm	1	13 h/day	45 %	64 %	18 km/h	27.5 °C
June	86 mm	11	13 h/day	71 %	75 %	16 km/h	28.2 °C
July	345 mm	27	13 h/day	83 %	85 %	16 km/h	28.2 °C
August	446 mm	29	13 h/day	86 %	87 %	17 km/h	27.8 °C
September	306 mm	27	12 h/day	83 %	86 %	14 km/h	28.2 °C
October	141 mm	22	12 h/day	64 %	84 %	11 km/h	29.2 °C
November	23 mm	4	12 h/day	49 %	73 %	11 km/h	29.4 °C
December	2 mm	0	11 h/day	45 %	52 %	14 km/h	27.3 °C

How Bissau compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Bissau	35 °C	21 °C	1,356 mm	364
Ziguinchor · Senegal	37 °C	19 °C	1,157 mm	365
Banjul · Gambia	31 °C	20 °C	654 mm	362
Serekunda · Gambia	31 °C	20 °C	664 mm	358
Kaolack · Senegal	37 °C	18 °C	502 mm	365

Where Bissau ranks

Ranking	Position	Value
Warmest sea temperatures in Africa in November	1stof 50	29 °C
The driest places in Africa in March	2ndof 50	0.01 mm
The driest places in the world in March	2ndof 50	0.01 mm
Warmest sea temperatures in Africa in July	5thof 50	28 °C
Warmest sea temperatures in Africa in October	6thof 50	29 °C
Warmest sea temperatures in Africa in June	7thof 50	28 °C

Planning a trip? See the best time to visit Bissau.

QuestionsCommon questions about Bissau’s climate

When is the best time to visit Bissau?

That depends on what you want, so the honest answer is a comparison rather than a single month. January, August, September sit closest to 20 °C on average, March is the warmest month and March the driest. The month-by-month table above has the full picture.

How hot does Bissau get?

In March, the warmest month, daily highs average 35 °C. About 262 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °C.

How cold does it get in winter?

Nights average 21 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Bissau?

August, averaging 446 mm over 29 days with rain. The driest month is March with 0 mm. The year as a whole averages 1,356 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Bissau rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.